{"id":80342,"date":"2020-05-05T07:42:07","date_gmt":"2020-05-05T05:42:07","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/dlya-yadra-linux-razvivaetsya-sistema-raspredelyonnogo-vypolneniya-potokov-popcorn"},"modified":"2020-05-05T07:42:07","modified_gmt":"2020-05-05T05:42:07","slug":"dlya-yadra-linux-razvivaetsya-sistema-raspredelyonnogo-vypolneniya-potokov-popcorn","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pt\/blog\/news\/dlya-yadra-linux-razvivaetsya-sistema-raspredelyonnogo-vypolneniya-potokov-popcorn","title":{"rendered":"Uma sistema de execu\u00e7\u00e3o distribu\u00edda de threads chamada Popcorn est\u00e1 em desenvolvimento para o n\u00facleo Linux.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Universidade Polit\u00e9cnica da Virg\u00ednia um patch escrito \u00e0 m\u00e3o para corre\u00e7\u00e3o.<\/a><\/noindex> para discuss\u00e3o entre desenvolvedores do n\u00facleo Linux sobre um conjunto de patches para a implementa\u00e7\u00e3o de um sistema de execu\u00e7\u00e3o distribu\u00edda de threads Popcorn<\/a><\/noindex> (Execu\u00e7\u00e3o Distribu\u00edda de Threads), que permite organizar a execu\u00e7\u00e3o de aplicativos em v\u00e1rios computadores com distribui\u00e7\u00e3o e migra\u00e7\u00e3o transparente de threads entre hosts. Com o Popcorn, aplicativos podem ser iniciados em um host e, sem interromper a opera\u00e7\u00e3o, movidos para outro host. Em programas multithread, a migra\u00e7\u00e3o de threads individuais para outros hosts \u00e9 permitida. <\/p>\n

Diferentemente do projeto CRIU<\/a><\/noindex>, que permite salvar o estado de um processo e retomar a execu\u00e7\u00e3o em outro sistema, o Popcorn fornece migra\u00e7\u00e3o din\u00e2mica e cont\u00ednua entre hosts durante a execu\u00e7\u00e3o do aplicativo, sem requerer a\u00e7\u00f5es do usu\u00e1rio e garantindo a consist\u00eancia da mem\u00f3ria virtual em todos os hosts onde as threads est\u00e3o sendo executadas simultaneamente. <\/p>\n

A pilha de software do Popcorn \u00e9 composta patches<\/a><\/noindex> para o n\u00facleo Linux e biblioteca<\/a><\/noindex> com testes que demonstram como usar chamadas de sistema do Popcorn para migrar threads em aplicativos executados de forma distribu\u00edda. No n\u00edvel do n\u00facleo, foram propostas extens\u00f5es ao subsistema de mem\u00f3ria virtual com a implementa\u00e7\u00e3o de mem\u00f3ria compartilhada distribu\u00edda (distributed shared memory), permitindo que processos em diferentes hosts acessem um espa\u00e7o de endere\u00e7o virtual compartilhado e consistente. A consist\u00eancia das p\u00e1ginas da mem\u00f3ria virtual \u00e9 garantida por meio de um protocolo que replica as p\u00e1ginas de mem\u00f3ria no host quando acessadas para leitura e invalida as p\u00e1ginas de mem\u00f3ria ao realizar grava\u00e7\u00f5es. <\/p>\n

A intera\u00e7\u00e3o entre hosts \u00e9 realizada por meio de um manipulador de mensagens em n\u00edvel de n\u00facleo, transmitidas atrav\u00e9s de um socket TCP. Observa-se que TCP\/IP \u00e9 utilizado para facilitar a depura\u00e7\u00e3o e testes durante o desenvolvimento. Os desenvolvedores entendem que, do ponto de vista de seguran\u00e7a e desempenho, TCP\/IP n\u00e3o \u00e9 a melhor maneira de transferir o conte\u00fado de estruturas de n\u00facleo e p\u00e1ginas de mem\u00f3ria entre hosts. Todos os hosts em que os aplicativos distribu\u00eddos est\u00e3o em execu\u00e7\u00e3o devem ter um n\u00edvel de confian\u00e7a id\u00eantico. Ap\u00f3s a estabiliza\u00e7\u00e3o dos algoritmos principais, um meio de transporte mais eficiente ser\u00e1 aplicado.<\/p>\n

O Popcorn est\u00e1 em desenvolvimento desde 2014 como um projeto de pesquisa para explorar as possibilidades de cria\u00e7\u00e3o de aplicativos distribu\u00eddos, cujos fluxos podem ser executados em diferentes n\u00f3s em sistemas computacionais heterog\u00eaneos<\/a><\/noindex> , onde podem ser combinados n\u00facleos baseados em diferentes arquiteturas de conjunto de instru\u00e7\u00f5es (Xeon\/Xeon-Phi, ARM\/x86, CPU\/GPU\/FPGA). O conjunto de patches proposto para desenvolvedores do n\u00facleo Linux suporta apenas execu\u00e7\u00e3o em hosts com CPU x86, mas existe uma variante mais funcional, o Popcorn Linux, que permite executar aplicativos em hosts com diferentes arquiteturas de CPU (x86 e ARM). Para usar o Popcorn em ambientes heterog\u00eaneos, \u00e9 necess\u00e1rio usar um compilador<\/a><\/noindex> baseado em LLVM. Durante a execu\u00e7\u00e3o distribu\u00edda em hosts com uma \u00fanica arquitetura, a recompila\u00e7\u00e3o por um compilador separado n\u00e3o \u00e9 necess\u00e1ria.<\/p>\n

\"Uma<\/a><\/noindex><\/center><\/p>\n

sobre a depend\u00eancia do Tor Browser da infraestrutura Mozilla. Vale lembrar que, devido a um problema com o certificado, os usu\u00e1rios do Tor Browser an\u00fancio<\/a><\/noindex> de um projeto semelhante Telefork<\/a><\/noindex> com a implementa\u00e7\u00e3o de um prot\u00f3tipo inicial de API para iniciar subprocessos em outros computadores no cluster (como fork(), mas move o processo desmembrado para outro computador).
\n O c\u00f3digo \u00e9 escrito na linguagem Rust e atualmente permite apenas clonar processos muito simples, que n\u00e3o utilizam recursos do sistema, como arquivos. Ao realizar a chamada telefork, a mem\u00f3ria e as estruturas associadas ao processo s\u00e3o clonadas em outro host, onde o manipulador do servidor (telepad) est\u00e1 em execu\u00e7\u00e3o. Usando ptrace, a reflex\u00e3o da mem\u00f3ria do processo \u00e9 serializada e, juntamente com o estado do processo e os registradores, \u00e9 transferida para outro host. A API tamb\u00e9m permite salvar o estado do processo em um arquivo e restaur\u00e1-lo a partir dele.<\/p>\n

<\/a><\/noindex><\/p>\n

Fonte: opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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